Title

  Nitrogen trifluoride (NF3) is a new type of electronic material that can undergo redox reactions with water vapor in humid air. The products of the reaction include: HF, NO, and HNO3. Please answer the following questions according to the requirements:

  (1) During the reaction, the molar ratio of the elements being oxidized to those being reduced is _______________.

  (2) Write the chemical equation for this reaction and indicate the direction and number of electron transfers: __________________. If 0.2 mol of HNO3 is generated in the reaction, the number of electrons transferred is ___________.

  (3) NF3 is a colorless, odorless gas, but once NF3 leaks into the air, it is still easy to detect. The phenomenon you would observe when this gas leaks is ______________________.

  (4) Once NF3 leaks, the pollution can be reduced by spraying with NaOH solution. In addition to NaNO2, NaF, and H2O, the products will definitely include

  ___________ (fill in the chemical formula).

  Answer

  (1) 2∶1

  (2) "Omitted"; 0.4NA or 2.408×1023

  (3) White mist and reddish-brown gas will be seen during the leak, along with a pungent odor

  (4) NaNO3